Nakuba kungase kubonakale njengemininingwane encane, impahla ye-valve ye-O-ring ibaluleke kakhulu. Indaba inganquma ukubekezelelana kwezinga lokushisa kwe-seal. Iphinde inikeze uphawu oluthile ukumelana namakhemikhali, kanti ezinye izinhlobo zenjoloba ziyahambisana noketshezi oluhlukene. Izinto ezimbili ezivamile zama-valve ebhola lezinyunyana yi-Viton ne-EPDM.

I-Viton (esithombeni kwesokudla) iyirabha yokwenziwa enamakhemikhali aphezulu kanye nokumelana nezinga lokushisa. I-EPDM imele i-Ethylene Propylene Diene Monomer futhi inesethi yayo yezinto eziyenza ibe yinto ethandwa kakhulu ye-O-ring. Uma uqhathanisa i-Viton ne-EPDM, izici eziningana okufanele zicatshangelwe: ukubekezelela izinga lokushisa, ukuhambisana kwamakhemikhali, kanye nezindleko. Funda ukuze uthole isiqhathaniso esigcwele.

Izimpawu zenjoloba ze-EPDM
Irabha ye-EPDM (irabha ye-EPDM) iyirabha eyinkimbinkimbi futhi engabizi enokusetshenziswa okubanzi. Ngokuvamile isetshenziselwa ukuvimbela amanzi ophahleni ngoba i-EPDM ivala kahle. Kuphinde kube yinto evamile yezigxivizo zefriji ngoba iyisivikeli mandla futhi inokumelana nezinga lokushisa eliphansi kakhulu. Ngokukhethekile, i-EPDM isebenza ngempumelelo ebangeni lokushisa elingu--49F ukuya ku-293F (-45C ukuya ku-145C), iyenze ifanelekele izinhlelo zokusebenza kunoma yikuphi ukushisa.

Nakuba amarabha amaningi ekwazi ukumelana nokushisa okuphezulu, ambalwa kuphela angakwazi ukuphatha amazinga okushisa aphansi njenge-EPDM. Lokhu kwenza kube yinketho yokuqala kunoma ngubani ozama ukuvala ezindaweni ezibandayo noma ngezinto ezibandayo. I-True Union Ball Valves with EPDM Sealed O-Rings Izicelo ezijwayelekile ze-EPDM zifaka ukufakwa kukagesi, ama-pool linings, amapayipi, abaqoqi bephaneli yelanga, ama-O-rings, nokunye.

Ngaphezu kokubekezelela okukhulu kwezinga lokushisa, i-EPDM inokumelana namakhemikhali okubanzi. Lokhu kufaka phakathi amanzi ashisayo, umusi, okokuhlanza, izixazululo ze-potash e-caustic, izixazululo ze-sodium hydroxide, uwoyela we-silicone / amafutha, namanye ama-asidi namakhemikhali amaningi ahlanjululwe. Ayifanele ukusetshenziswa nemikhiqizo kawoyela wamaminerali njengamafutha okugcoba, uwoyela noma izibaseli. Ukuze uthole ukuhambisana kwamakhemikhali okuthile kwe-EPDM, chofoza lapha. Lezi zakhiwo ezihlaba umxhwele, ezihlanganiswe nentengo ephansi, zenza i-EPDM ibe yinto ethandwa kakhulu yokuvala uphawu.

Izimpawu ze-Viton
IViton iyirabha yokwenziwa kanye ne-fluoropolymer elastomer. "I-Fluoropolymer" isho ukuthi le nto inokumelana okuphezulu nezincibilikisi, ama-asidi nezisekelo. Igama elithi “elastomer” ngokuyisisekelo lishintshashintsha nelithi “irabha”. Ngeke sixoxe ngomehluko phakathi kwe-elastomer nerabha lapha, kodwa sizoxoxa ngokuthi yini eyenza i-Viton ikhetheke kangaka. Izinto ezisetshenziswayo zivame ukubonakala ngombala oluhlaza noma onsundu, kodwa okuhlukanisa ngempela ukuminyana kwazo. Ukuminyana kwe-Viton kuphakeme kakhulu kunezinhlobo eziningi zenjoloba, okwenza uphawu lwe-Viton lube olunye oluqine kakhulu.

I-Viton inebanga elibanzi lokubekezelela izinga lokushisa ukusuka ku -4F kuya ku-410F (-20C kuya ku-210C). Amazinga okushisa aphezulu i-Viton ekwazi ukumelana nawo ayenza ifaneleke ezinhlelweni zokushisa eziphezulu. I-Viton ivame ukusetshenziswa kuma-O-rings, amagilavu ​​angamelana namakhemikhali neminye imikhiqizo ebunjiwe noma ekhishwe. Ama-O-rings enziwe nge-Viton mahle kakhulu ekujuleni kwe-scuba, izinjini zezimoto nama-valve ahlukahlukene.

Uma kukhulunywa ngokumelana namakhemikhali, iViton ayifani. Imelana nokugqwala okuvela oketshezini olubanzi olubanzi namakhemikhali kunanoma iyiphi i-elastomer engeyona i-fluorinated. Ngokungafani ne-EPDM, i-Viton ihambisana namafutha, amafutha, izinto zokuthambisa kanye nama-acid amaningi angaphili. Iphinde imelane ngokwedlulele nokucindezelwa, i-atmospheric oxidation, ukukhanya kwelanga, isimo sezulu, amafutha emoto anomoya-mpilo, ama-aromatics, isikhunta, isikhunta, nokuningi. Iyakwazi futhi ukumelana nokushiswa kunamanye amarabha amaningi. Funda kabanzi mayelana nokwenza nokungamelwe kwenziwe ngamakhemikhali e-Viton.

Inkinga enkulu ngeViton yintengo yayo. Ekukhiqizeni, kubiza cishe izikhathi eziyisi-8 ukwenza inani lezinto ezibonakalayo njenge-EPDM. Uma uthenga umkhiqizo oqukethe inani elincane kuphela lalezi zinto zenjoloba, intengo ingase ingahlukani kakhulu. Kodwa uma u-oda ngamanani amakhulu, ungalindela ukuthi izingxenye ze-Viton zibiza kakhulu kune-EPDM.

Izimpawu ze-Viton kanye ne-EPDM
I-Viton vs EPDM Ishadi Lerabha Lokufaka uphawu

Ngakho iyiphi impahla engcono kakhulu? Le mibuzo ayilungile neze. Zombili izinto ezisetshenziswayo zinezinhlelo zokusebenza ezithile lapho zilungele khona, ngakho konke kuncike emsebenzini ezizowenza. EyethuI-CPVC Ball Check ValvesfuthiI-CPVC Swing Check Valveszitholakala ngezigxivizo ze-Viton noma ze-EPDM. Lezi zimpawu zenziwe ngama-O-rings afakwe ezintweni ezifakiwe. Lawa ma-valve wonke aklanyelwe ukuba ahlakazwe kalula ukuze anakekeleke kalula, ngakho anemizimba ekhishwayo.

Uma udinga i-valve yesistimu yamanzi, kungakhathaliseki izinga lokushisa, i-valve ene-EPDM seal ngokuvamile iyisinqumo esingcono kakhulu. Ngaphandle kokubekezelela okuhlukile kwezinga lokushisa, umehluko omkhulu phakathi kwezinto ezimbili ukumelana kwazo namakhemikhali. I-Viton ilungele ukusetshenziswa nophethiloli nezinye izinto ezigqwala, kodwa uma usebenza nento engenabungozi njengamanzi, lokhu kuqina okweqile akudingekile.

I-Viton ilungile uma ufuna ukuqina okuphezulu ezimeni ezicindezelayo. njengoba kushiwo ngaphambili, ama-Viton seal abambelele cishe kunoma yiluphi uhlobo lokugqwala kanye ne-asidi. Nakuba i-EPDM ngokwayo inzima kakhulu, ayikwazi ukufanisa i-Viton ekumelaneni namakhemikhali ngokuphelele.

Kulesi sihloko, besiqhathanisa izinto ezimbili: I-Viton vs EPDM, yikuphi okungcono? Impendulo iwukuthi akekho “ongcono” kunomunye. Zonke ziyizinto ezisezingeni eliphezulu ezinokusetshenziswa okungapheli. Uma kufanele ukhethe phakathi kwazo, bheka amazinga okushisa ozochayeka kuwo, amakhemikhali ozobe uwachaya kuwo, futhi okubaluleke kakhulu, ibhajethi yakho. Qiniseka ukuthi uthola ivalvu oyidingayo ngentengo engenakuhlulwa!